Knee joint structure

Abstract

The invention relates to a knee joint structure. The knee joint structure comprises a knee joint head, a knee joint body and at least one arc part, the knee joint head is provided with a reset devicecomposed of a piston, an elastic body and an adjusting cover and a transmission shaft, the transmission shaft is provided with a push rod shaft, the push rod shaft is pivoted with a push rod capable of pushing the piston, and the knee joint body is pivoted with the knee joint head through a connecting rod. When the knee joint is bent, the push rod can push the elastic body to store elastic force,and returns to the original shape through the elastic force of the elastic body when the knee joint reversely pivots. The reset device and the push rod are arranged on the knee joint head. The critical angle of knee joint bending can be larger than the bending angle during walking; normal walking gait can be completed in each step, the defect that in the prior art, the knee joint exceeds a critical angle after being bent, and consequently the knee joint which should be straightened originally continues to be bent unexpectedly and is prone to falling down and being injured is overcome, safety can be improved, and the strength of the elastic body can be adjusted conveniently to be matched with the walking speed of a user.

Description

technical field [0001] The present invention relates to a knee joint structure, in particular to a knee joint structure for prosthesis users that can increase walking safety, facilitate adjustment of joint recovery strength, and save walking effort. Background technique [0002] Prosthetic limbs mainly refer to artificial limbs, which are used to replace the functions of disabled limbs, or to modify the appearance of disabled limbs. Among them, the knee joint is the key to the design, because it is related to the gait and mechanical balance during walking and must have Replace the support and walking functions of the normal knee joint. [0003] Conventional knee structures, see Figure 15 , Figure 16 , mainly comprising a knee joint head 91, a knee joint body 92, and a connecting rod 93 and an arc 94 for connecting the knee joint head 91 and the knee joint body 92, wherein the knee joint body 92 is provided with a reset device 921, and the connecting rod 93 is provided wi...

AI Technical Summary

Problems solved by technology

[0004] see Figure 16 to Figure 18 , because the reset device 921 is set on the knee joint body 92, and the protrusion 931 is set on the connecting rod 93, the critical angle of knee joint bending is only about 60°~80° due to the transformation of the axis point during the knee joint movement. (like Figure 16 ), but its actual use when walking is: when the knee joint is walking fast, the bending angle easily exceeds the critical angle, causing the knee joint that should return to the straight state to continue bending unexpectedly (such as Figure 17 The bending direction of the knee joint, the arrow in the figure represents that the knee joint head 91 and the knee joint body 92 are not pivoting towards straightening), which cannot complete the normal walking gait and is prone to fall and injury

[0005] In addition, because the reset device 921 is arranged on the knee joint body 92, the push rod 931 is arranged on the structural arrangement relationship of the connecting rod 93, and the knee joint body 92 is used to accept the calf prosthesis, so that when the strength of the elastic body is to be adjusted, it must be removed first. Calf prosthetics, causing difficulty in adjusting the strength of the elastic body

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